The Green Bay Packers now must move forward without a major piece of their offensive line.

NFL.com's Ian Rapoport reported Monday that Bryan Bulaga, the Packers' starting left tackle, is done for the season after tearing his ACL during Saturday's team scrimmage.

The Packers had been counting on Bulaga to provide some stability on Aaron Rodgers' blindside. Bulaga was the starter at right tackle last season and had been receiving good reports on his transition during camp.

The severity of Bulaga's injury is surprising considering he was able to finish Saturday night's 64-play scrimmage. It's unclear when the injury was suffered, but Bulaga reported to the team after the scrimmage that something felt off in the knee.

Now the Packers must formulate a Plan B. Bob McGinn of the Milwaukee Journal Sentinel reported Monday that the Packers are expected to move rookie David Bakhtiari into the starting lineup, though it's unclear if he'll play at right or left tackle. Marshall Newhouse, who had been the team's projected right tackle, is the other option to replace Bulaga.

Either way, this is a terrible development for the Packers, who head toward the start of the preseason with serious question marks about their ability to protect their franchise quarterback.